Oil burner door



ug. 3L 1937.. s J. HEIMAN 2,09L442 OIL BURNER DOOR Filed 0G12.` 28, 1936 SIONEYJ /s/MAN HTTORNE' Y Patented Aug. 31, 1937 'f UNITED STATI-:is PATENT? "o1-frica i i y 2,091,442 y f on. BURNERfD'ooR' y y Sidney J. Heiman, St.' Louis, Mo'.

Application October 28, 1936, Seriali-*1o. 107,973v

The specific objectv of my invention. is to make a` door for oil. burners. In oilbur-ners it is necessary tohave a door. positioned. in the fire box, in order to give select-ive access-to theburners in the fire box. The door, when closed, must form a perfect seal so as not to admit air into the re box. This is essential in order not to dis-y turb the'combustion or circulation'of heated air in the re box. The doorf may bevused equally 1'0 well in gas, coal or wood burners.

methods of manufacture, it is noti possible to have these facesmachined sufficiently exactly to form a perfect seal. If the surfaces of the door and those surrounding the re box opening are not fitted exactly, air will leak between the surfaces from the outside of the door into the re box. Furthermore a slight warping of the fire box opening will make even an imperfect seal impractical with the conventional door.

Furthermore the door structure must be such that no practical care is necessary in locking the door, in order to close it tightly, because the ordinary user of the oil burner will not exercise they amount of care that is necessary to tightly close an ordinary door. The structure must be simple and inexpensive, and lend itself readily to multiple production. The structure herein described meets all these requirements. With these and other'objects in view, my invention has relation to certain novel features of construction and arrangement of parts, as will be hereinafter more fully described, pointed out in the claims and illustrated in the drawing, in which Fig. 1 is .a front elevation of the frame and door, together with its jointure means to the fire box of an oil burner.

Fig. 2 is a top plan view showing the door in its opened position.

Fig. 3 is an enlarged central, vertical, sectional view, partially in elevation.

Numeral 4 designates the re box opening of the re box 5. The fire box 5 is made in the usual manner with the tapered wall 6. Numeral 'I designates lugs formed on the fire box 5 on each side thereof at the bottom, having a hole 8 formed therein. Numeral 9 is the outer door, which is hingedly secured to the lug 1, by means of the threaded bolts I0 passing through a hole in the outer door 9 and the hole in the lug l.

On the fire box 5, at the top, adjacent the lire box opening 4, is formed the lug II. The outer secured to the inner endof the pin I5fby means of the set. screw I8. The pin I5` isl of such length andthe finger Il is securedto it atsuch a position, that when the. outer door '9 is in its closed position the finger If'l will be in frictional engagement with the inner face of the lug I I'.

Finger I1 has a cam face I'l' for engagement with lug II, to pull door' Suptight.y f

The structure thus far described is convent tional. Applicants invention consists in the following structure per se andin combination with the structure thus far described:

Numeral I9 designates an inner door. Centrally positioned interiorly on the outer door 9 integrally is formed the fragment of a sphere 29. Numeral 2I designates a projection on the inner door I9. In the projection 2I is formed the spherical cavity 22. The spherical cavity 22 and the fragment of the sphere 20 are of such shape and size that the fragment of the sphere 20 fits on the spherical cavity 22 exactly, the fragment of a sphere and the rspherical cavity 22 forming a ball and socket joint.

Numeral 23 designates a screw passing through the projection 2| of the inner door I9 and into the center of the fragment of a sphere 29. The screw 23 is not secured tightly in the inner door I9, but suiliciently loosely that the inner door I9 may be rocked on the fragment of the sphere 29 within narrow limitations. Numeral 24 designates the face of the fire box opening with which the face of the inner door I9 will come into engagement when the outer door 9 is closed. In order to limit the movement of the inner door I 9 on the fragment of the sphere 20, lugs 25 are formed on the inner door I9 between the inner door I9 and the inner face of the vertical frame I2 of the outer door 9. Lugs 26 are formed on the inner face of the vertical wall I2 of the outer door 9. The thickness of the lugs 25 and 26 are slightly less than the distance between the outer face of the inner door I9 and the inner face of the outer door 9. The lugs 25 and 26 are staggered, so as not tol come into contact with each other. The space between the lugs 25 and the inner face of the vertical Wall I2 is the same as the space between the lugs 26 and the outer face of the inner door I9. This distance represents the amount of possible rotation of the inner door I9 on the fragment of a sphere 20.

Glazed openings 2l in the inner door I9 register with the opening I4 in the outer door 9.

It- Will be observed that when the structure thus far described is assembled as indicated, provided the parts are made of substantially the 10 size herein described and illustrated in the drawing, that when the outer door `9 is closed that the inner door I9 will be closed. It is obvious that by the structure described that the inner door I9 becomes centered over the re box open-v ing 4, and that if there are any differences in v size, through warping or otherwiseof the surfaces in contact between the inner door I9 and the face of the fire box opening 4, that the in-k ner door I9 will be slightly rocked on fragment of a sphere 20, forming a perfect seal between' the inner door I9 and the, face of the fire .box opening 24'. l

What I claim and mean to secure byLetters Patent is:

25 1. In combination with al fire box, an outer doorhingedly secured thereto, an inner door secured to said outer door by means of a ball and socketI joint, means of locking said outer door to said re box and simultaneously securing said inner door' against the faces of the opening of said fire box, lugs secured on the inner face of said outer door and on the outer face of said l inner door for limiting the possible oscillating of said inner door on said outer door.

- 2. In combination with a stove having an opensaid stove, an inner door secured to said outer door by means of a ball and socket joint, means of locking said outer door to said stove over the opening in said burner and simultaneously securing said inner door against the faces of the opening in said stove, lugs secured on the inner face of said outer door and on the outer face of said inner door for limiting the possible oscillation of said inner door on said outer door.

3. In combination with a stove having an opening therein, an outer door hingedly secured thereto in operative position relative the opening in said stove, an inner door secured centrally and interiorly to said outer door by means of a ball and socket joint, one portion of which is secured to said outer door and the other portion of which is secured to said inner door, the portions of saidball and socket joint being secured together in a rocking manner by means "of a screw passing through one portion to the other portion, kmeans for locking said outer door to said stove over the opening therein, and simultaneouslysecuring said inner door against the faces of the opening in said stove, lugs formed on the inner door between the inner door and the inner face of the vertical frame of the outer door, and similar lugs formed on the inner face of the Vertical wall of the outer door, the thickness of said lugs being slightly less than the distance between the outer face of the inner door and the inner face of the outer door, the lugs on the inner door being staggered relative lthe lugs on the outer door, said lugsso constructed as to limit the possible oscillation of said inner door on said outer door.

SIDNEY J. HEIMAN. l 

